Long-awaited plans for an underpass at Coventry’s “kamikaze island” have been re-drawn and face more hold-ups.

The Highways Agency has announced a new public consultation on revisions to the Toll Bar Island scheme.

The changes since the scheme went to a public inquiry in 2010 are proposed because of hold-ups to the planned redevelopment of Jaguar Whitley business park – which would have included changes to nearby Styvechale roundabout.

The Highways Agency says that redevelopment is not now expected until after the Toll Bar island scheme’s completion.

The scheme is seen as important to the Gateway project for “up to 14,000” jobs near to Coventry Airport – another reason for the scheme’s revisions.

The Tollbar End island underpass plan – providing a new link from the A45 to the A46 – was included in Chancellor George Osborne’s budget announcements in 2011.

Fourteen years in the making, the government finally announced the scheme would be one of several major road schemes designed to kickstart the flagging economy.

It was then hoped the first spades in the ground would be this year.

But now the Highways Agency predicts work to start between January and March next year, and will not be completed until the end of 2017.

The cost is now estimated at between £109million and £150million.

A four-week public consultation began this week on the modifications to the scheme, which includes improvements on a two-mile stretch to the Styvechale junction.

The proposals have been sent to “interested parties” for comment including MPs and previous protestors and local residents – alongside updated traffic forecasts and environmental impact assessments.

Ministers last month gave formal “interim” final approval, and a final go-ahead will depend on responses to the consultation.